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Physics

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21. Liquid metal is
 
  • A. zinc
  • B. saline
  • C. lead
  • D. mercury
 
22. Colour formation in thin films is due to
 
  • A. reflection
  • B. refraction
  • C. interference
  • D. diffraction
 
 
23. A transformer
 
  • A. transforms energy
  • B. generates e.m.f.
  • C. transforms frequency
  • D. transforms voltage
 
24. Sound travels fast through
 
  • A. water
  • B. air
  • C. steel
  • D. vacuum
 
25. The lens used to rectify long sight is
 
  • A. convex lens
  • B. concave lens
  • C. plano concave lens
  • D. plano convex lens